Preheater and mixer



Au 28, 1923. I 1,466,406

' J B. M DONALD v PREHEATEB AND MI-XER Filed Jan. 23, 1922 3wenbot Jack5. Mafia/Yaw Patented Aug. 28, 1923.

UNITED STATES JACK B. MACDONALD, or OAKLAND, CALIFORNIA.

rnnnna'rnn AND MIXER.

Application filed January 23, 1922. Serial No. 531,030.

To all whomit may concern:

Be it known that I, JACK B. MACDONALD, a citizen of the United States,residing at Oakland, in the county of Alameda and State of California,have invented certain new and useful Improvements in Preheaters andMixers, of which the following is a' specification.

My invention is an improved preheater and mixer for the intake charge ofinternal combustion engines.

The object of my invention is to'provide a preheater which isinexpensive and efficient in operation, and may be readily attached toany engine without replacing any of the standard equipment.

The preheater is formed in the same shape as the manifold flange and ispositioned be tween the intake manifold and the carburetor. Referring tothe annexed drawing: Figure 1 is a side ,view of my improved preheaterin position, with parts broken away to show details of construction.

Figure 2 is a diagrammatic view of the wiring and electric control.

In the drawing. the numeral 1 indicates my preheater positioned betweenthe intake manifold 2 and the carburetor 3. The outer casting-4comprises the top and sides of the preheater. An inner casting 5 formsthe bottom of the preheater and extends centrally upward to the top andisv flanged in the casting 4. A central bore 6 ofthe casting 5 conformsin size and position to the outlet of the carburetor and the intakemanifold.

A plurality of beating paddles 7 are positioned in the bore 6, and arejournaled' on a shaft 8 which is secured in spiders 9 and.

10 at the top and bottom respectively of the preheater. Adjacent paddlesrotate in on posite directions, and are actuated by the gas passingupward into the intake manifold 2. The gas passing through the bore '6and engaging the paddles 7 is thoroughly mixed and agitated, and isthrown outwardly against the heated walls of the bore, as will bedescribed.

The central stem of the casting 5 is en-' sistance wire 12 is wound. Theresistance wire heats the walls of the bore 6 and thus preheats the gascharge, which gives increased power andflexibility to the engine.

Cap screws 13 and 14 pass through the intake manifold flange, the upperwall of the casting 4, the lower wall of the casting 5 and into thecarburetor 3, thus securely and removably joining these memberstogether.

A thermostatic controlled switch 15 is secured to the casting 4, andcomprises an expanding metal bar 16, which receives its heat from thewalls of the casting 4 and in expanding is adapted to engage one leg 17of the electric switch, forcing it upwardly to break the contact 18.Current is supplied to the coil 12 from a battery, 20, through lead 21to a switch 22, lead 23 to the thermostat 15, and lead 24 to the coil..The coil is grounded through lead 25 on the casting 4. A lead 26 groundsthe battery.

Having described my invention, I claim:

1. 'Apreheater and gas mixer comprising an outer casting, an innercasting having a central bore, means for heating said inner casting, androtatable agitating means in said bore.

2. In combination with a carburetor and an intake manifold, a preheaterand mixer comprising an outer casting, an inner casting, said innercasting having a central bore in alignment with the carburetor andmanifold, a resistance coil surrounding said bore,

means for automatically controlling the current flowing through saidcoil, beating paddles journaled in said bore, and means for securing thepreheater to the manifold and the carburetor. I

3. In combination with a carburetor and an intake manifold, a preheaterand mixer comprising an outer casting and an inner casting, said innercasting having a central bore in alignment with the carburetor andmanifold, and a resistance coil wound on said inner casting around thecentral bore.

4. In combination with a carburetor and an intake manifold, a preheaterand mixer,

comprising an outer casting and an inner casting, a'mica jacketsurrounding the inner casting, said inner casting having a central borein alignment with the carburetor and manifold, and a resistance coilwound on said mica jacket around the central'bore.

In testimony whereof I aflix my signature.

I JACK B. MAGDONALD.

